#!/bin/sh
################################################################################
##                                                                            ##
## Copyright (c) International Business Machines  Corp., 2006                 ##
##                                                                            ##
## This program is free software;  you can redistribute it and#or modify      ##
## it under the terms of the GNU General Public License as published by       ##
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## This program is distributed in the hope that it will be useful, but        ##
## WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY ##
## or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License   ##
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## You should have received a copy of the GNU General Public License          ##
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################################################################################
#
# File:
#   route6-change-gw
#
# Description:
#   Verify the kernel is not crashed when the gateway of an IPv6 route is
#   changed frequently
#    test01 - by route command
#    test02 - by ip command
#
# Setup:
#   See testcases/network/stress/README
#
# Author:
#   Mitsuru Chinen <mitch@jp.ibm.com>
#
# History:
#	Mar 16 2006 - Created (Mitsuru Chinen)
#
#-----------------------------------------------------------------------
# Uncomment line below for debug output.
#trace_logic=${trace_logic:-"set -x"}
$trace_logic

# Make sure the value of LTPROOT
LTPROOT=${LTPROOT:-`(cd ../../../../ ; pwd)`}
export LTPROOT

# Total number of the test case
TST_TOTAL=2
export TST_TOTAL

# Default of the test case ID and the test case count
TCID=route6-change-gw
TST_COUNT=0
export TCID
export TST_COUNT

# Check the environmanet variable
. check_envval || exit $TST_TOTAL

# The number of times where route is changed
NS_TIMES=${NS_TIMES:-10000}

# The number of the test link where tests run
LINK_NUM=${LINK_NUM:-0}

# Network portion of the IPv6 address
IPV6_NETWORK="fec0:1:1:1"

# Netmask of for the tested network
IPV6_NETMASK_NUM=64

# Host portion of the IPv6 address
LHOST_IPV6_HOST=":2"		# src
RHOST_IPV6_HOST_TOP="10"	# gateway
RHOST_IPV6_HOST_LAST="19"

# The destination network
DST_NETWORK="fd00:100:1:1"	# dest network would be fd00:100:1:1:::/64
DST_HOST="5"
DST_PORT="7"


#-----------------------------------------------------------------------
#
# NAME:
#   do_setup
#
# DESCRIPTION:
#   Make a IPv6 connectivity
#
# SET VALUES:
#   rhost_ipv6addr	- IPv6 Address of the remote host
#   lhost_ifname	- Interface name of the local host
#   rhost_ifname	- Interface name of the remote host
#
#-----------------------------------------------------------------------
do_setup()
{
    TCID=route6-change-gw
    TST_COUNT=0

    # Get the Interface name of local host
    lhost_ifname=`get_ifname lhost ${LINK_NUM}`
    if [ $? -ne 0 ]; then
	tst_resm TBROK "Failed to get the interface name at the local host"
	exit $TST_TOTAL
    fi

    # Get the Interface name of remote host
    rhost_ifname=`get_ifname rhost ${LINK_NUM}`
    if [ $? -ne 0 ]; then
	tst_resm TBROK "Failed to get the interface name at the remote host"
	exit $TST_TOTAL
    fi

    # Initialize the interfaces of the remote host
    initialize_if rhost ${LINK_NUM}

    # Set IPv6 address to the interface of the remote host
    rhost_part=$RHOST_IPV6_HOST_TOP
    rhost_part_hex=`printf "%x" $rhost_part`
    while [ $rhost_part -le $RHOST_IPV6_HOST_LAST ]; do
	rhost_part_hex=":`printf "%x" $rhost_part`"
	add_ipv6addr rhost ${LINK_NUM} ${IPV6_NETWORK} ${rhost_part_hex}
	if [ $? -ne 0 ]; then
	    tst_resm TBROK "Failed to assign IP address to the interface at the remote host"
	    exit $TST_TOTAL
	fi
	rhost_part=`expr $rhost_part + 1`
    done
}


#-----------------------------------------------------------------------
#
# NAME:
#   do_cleanup
#
# DESCRIPTION:
#   Recover the tested interfaces
#
#-----------------------------------------------------------------------
do_cleanup()
{
    killall -SIGHUP ns-udpsender >/dev/null 2>&1

    # Initialize the interfaces
    initialize_if lhost ${LINK_NUM}
    initialize_if rhost ${LINK_NUM}
}


#-----------------------------------------------------------------------
#
# FUNCTION:
#   test_body
#
# DESCRIPTION:
#   main code of the test
#
# Arguments:
#   $1: define the test type
#       1 - route command case
#       2 - ip command case
#
#-----------------------------------------------------------------------
test_body()
{
    test_type=$1

    TCID=route6-change-gw0${test_type}
    TST_COUNT=$test_type

    case $test_type in
	1)
	test_command="route"
	;;
	2)
	test_command="ip"
	;;
	*)
	tst_resm TBROK "unspecified case"
	return 1
	;;
    esac

    tst_resm TINFO "Verify the kernel is not crashed when the gateway of an IPv6 route is changed frequently by $test_command command in $NS_TIMES times"

    # Initialize the interface of the local host
    initialize_if lhost ${LINK_NUM}

    # Assign IPv6 address to the interface of the local host
    add_ipv6addr lhost ${LINK_NUM} ${IPV6_NETWORK} ${LHOST_IPV6_HOST}
    if [ $? -ne 0 ]; then
	tst_resm TBROK "Failed to assign an IPv6 address at the local host"
	return 1
    fi

    # Check the connectivity to the gateway
    rhost_part=$RHOST_IPV6_HOST_TOP
    rhost_part_hex=":`printf "%x" $rhost_part`"
    check_icmpv6_connectivity $lhost_ifname ${IPV6_NETWORK}:${rhost_part_hex}
    if [ $? -ne 0 ]; then
	tst_resm TBROK "Test Link $LINK_NUM is somthing wrong."
	return 1
    fi

    # Set the variables regarding the destination host
    dst_addr=${DST_NETWORK}::${DST_HOST}
    dst_network=${DST_NETWORK}::

    # Set the first route
    case $test_type in
	1)
	route -A inet6 add ${dst_network}/64 gw ${IPV6_NETWORK}:${rhost_part_hex} dev $lhost_ifname
	;;
	2)
	ip -f inet6 route add ${dst_network}/64 via ${IPV6_NETWORK}:${rhost_part_hex} dev $lhost_ifname
	;;
    esac

    # Load the route with UDP traffic
    ns-udpsender -f 6 -D $dst_addr -p $DST_PORT -b -s 1452
    if [ $? -ne 0 ]; then
	tst_resm TFAIL "Failed to run a UDP datagram sender"
	return 1
    fi

    # Loop for changing the route
    cnt=0
    while [ $cnt -lt $NS_TIMES ]; do
	pre_rhost_part_hex=$rhost_part_hex
	rhost_part=`expr $rhost_part + 1`
	if [ $rhost_part -gt $RHOST_IPV6_HOST_LAST ]; then
	    rhost_part=$RHOST_IPV6_HOST_TOP
	fi
	rhost_part_hex=":`printf "%x" $rhost_part`"

	case $test_type in
	    1)
	    route -A inet6 add ${dst_network}/64 gw ${IPV6_NETWORK}:${rhost_part_hex} dev $lhost_ifname
	    route -A inet6 del ${dst_network}/64 gw ${IPV6_NETWORK}:${pre_rhost_part_hex} dev $lhost_ifname
	    ;;
	    2)
	    ip -f inet6 route add ${dst_network}/64 via ${IPV6_NETWORK}:${rhost_part_hex} dev $lhost_ifname
	    ip -f inet6 route del ${dst_network}/64 via ${IPV6_NETWORK}:${pre_rhost_part_hex} dev $lhost_ifname
	    ;;
	esac
	if [ $? -ne 0 ]; then
	    tst_resm TFAIL "Failed to change the gateway to ${IPV6_NETWORK}.${rhost_part}"
	    return 1
	fi

	# Rerun if udp datagram sender is dead
	ps auxw | fgrep -v grep | grep ns-udpsender > /dev/null
	if [ $? -ne 0 ]; then
	    ns-udpsender -f 4 -D $dst_addr -p $DST_PORT -o -s 1472
	    if [ $? -ne 0 ]; then
		tst_resm TFAIL "Failed to run a UDP datagram sender"
		return 1
	    fi
	fi

	cnt=`expr $cnt + 1`
    done

    # Kill the udp datagram sender
    killall -SIGHUP ns-udpsender >/dev/null 2>&1

    tst_resm TPASS "Test is finished correctly."
    return 0
}


#-----------------------------------------------------------------------
#
# Main
#
# Exit Value:
#   The number of the failure
#
#-----------------------------------------------------------------------

RC=0
do_setup
test_body 1 || RC=`expr $RC + 1`      # Case of route command
test_body 2 || RC=`expr $RC + 1`      # Case of ip command
do_cleanup

exit $RC
